To add your brand colors to mobi and see what it will look like publicly, click on Mobi in the left navigation. 

Here you can update the colors of mobi. They default to the VisitDays preset colors.
The Primary color shows up as the floating "Schedule A Visit" Color. 

You can see this view by selecting "Generate Preview." 

This will open up a preview of mobi within your platform so you can see what it will look like!
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You can schedule students through this view or by using Add Attendee at the top of the page.